ouff, the bug is quite tricky... at least 3 factors are in play:

1) which way i have closed SweetHome previous time (menu File -> Close project, OR just pressing close button in the upper right corner)
2) which view was active in the moment of closing app
3) what i did with wiews menu after app is open "blanc" (no file open yet), before opening the file (nothing, OR switching Top wiew -> Virtual visit once, OR switching then swithing back)

Some right sequence exist - once or twice i closed app, re-opened it, and all the furniture appeared correctly! I did some 50 or 100 experiments closing and re-opening in hope the workaround can be found by just combining some order of clicks. Can't find it, cant repeat succesful restarting, too much combinations possible [:(] [:(] [:(] or, maybe, this bug is irregular...

I always start app with desktop icon (newer tried to double-click project file), and i open only one project at once (no multiwindow mode).

After re-opening the empty app (no project opened yet), view setting in the menu isn't always the same. Sometimes Top view is chosen, sometimes Virtual visit.

Once a file is yet open with "white rectangles", nothing helps. Switching Top wiew \ Virtual visit changes nothing. But, sometimes, it opens rigth way!

Quite annoying situation. Hope i brought any useful info...